It could be also not about sowing discord but that failure itself is the goal in some cases.
What is said many times doesn't correspond to the real agenda. Take healthcare. Possibly a good number of politicians who crow about the evils of Obamacare really don't want it to fail. Otherwise it's going to cost their local districts money even though it's (conceptually) wildly unpopular with the constituency. So gosh darn it, they are trying really hard to overturn that evil communist plot but the pesky Democrats just keep blocking them at every turn!
With Trump who knows. He is a wildcard. It's hard to say what the real agenda is but it's probably not what he is verbalizing. Or if it is he isn't a real politician yet :)
Of course, he could be playing 10-dimensional chess and cleverly be seeking more to wreak long-term chaos and disorder than to advance the superficially apparent agenda his actions seem to be aimed at. In which case you'd be right.